Nutritional value: Lettuce is rich in vitamin C, which can enhance the baby's immunity. Lettuce contains minerals such as calcium, iron and copper, among which calcium is the main substance that affects the development of baby's bones and teeth, and can also prevent rickets; Iron and copper can promote the synthesis of hemoglobin, stimulate the development of red blood cells, and prevent the baby from loss of appetite and anemia;

(1) Lettuce is the neutralization of alkaline food and acidic food such as grain and meat, which can adjust the acid-base balance of body fluids. Lettuce is rich in dietary fiber, which can stimulate gastric juice secretion and intestinal peristalsis, increase the contact area between food and digestive juice, help babies digest and absorb, promote the discharge of metabolic waste and prevent constipation.

(2) Selection: lettuce with fresh, tender, green color, big head and short stem should be selected.

(3) Precautions: First, soak the lettuce in clear water for 20-30 minutes, and then rinse it repeatedly with clear water. Because alkaloids in rice-washing water can dissolve harmful substances such as pesticides, lettuce can be soaked in rice-washing water for 10 minute, then the immersion liquid is poured out and washed repeatedly with flowing water.